I buy the large plastic container of fresh "spring" salade mix for my "grand"guinea pigs, ok so I don't have grandchildren yet *L* but it's great for them, and no lettuce is in the mix, dandelion leaves,spinach etc. so handy because it's all in one container, you can buy honeysticks for them at pet food stores also, they love calcium blocks, and don't forget woood, they do have to shave down their teeth just like other rodents, pine blocks are great, and you can buy flavored wood for them.

Iceburg lettuce has no nutritional value so it is not recommended to feed to Guinea pigs.They do however need and thrive on Romaine lettuce!You can also feed them collard greens,dandelion greens(which they LOVE)green,yellow and red peppers,.Guinea pigs do not need "treats"they love healthy food,pellets and hay.